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Investigate activating the IRCE LLVM pass #22987

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@huonw

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@huonw

"Inductive range check elimination" may help remove bounds checks inside loops. That said, the extra compilation time required to run the pass may not be worth it (since our iterators work well).

http://llvm.org/docs/Frontend/PerformanceTips.html

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    A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.A-codegenArea: Code generationI-slowIssue: Problems and improvements with respect to performance of generated code.

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